
Motor questions
Authored by Stuart Fox
Engineering
Vocational training
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Describe the function of the capacitor in a capacitor start motor.
Provide a phase shift in the auxiliary winding to produce high starting torque and is disconnected after the motor reaches speed
Filter supply harmonics to improve line quality during running
Increase the steady‑state power factor of the motor under normal operation
Store DC energy to supply the main winding during starting
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
List 3 types of AC motor controller.
Variable frequency drive (VFD)
Soft starter
Direct‑on‑line (DOL) starter
DC chopper
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
State 2 types of single‑phase AC motor.
Capacitor‑start induction motor
Shaded‑pole motor
Three‑phase squirrel‑cage induction motor
DC shunt motor
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain why star‑delta motor control equipment is used in preference to direct on line.
To reduce starting current and mechanical stress compared with direct‑on‑line starting
To automatically reverse rotation without additional wiring
To increase starting torque beyond direct‑on‑line capability
To improve full‑load efficiency of the motor during normal operation
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main advantage of using an autotransformer starter for induction motors compared to direct-on-line starting?
It eliminates the need for overload protection
It reduces the initial voltage applied to the motor, lowering starting current and mechanical stress
It increases the full-load efficiency of the motor
It reverses the direction of rotation automatically
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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